I've looked at Eroom before, and I though their functionality is somewhat shallow, it's very thorough. And they've been able to get some really big accounts, although the ones I've talked to also said they hated it.
There's also inclusion.net, formerly Planet Intra, also known as Intra.Net, which looks pretty good. I particularly like their home page for talking about deployment phases, verticals, what value the customer will get from using this software, and a short ROI story.
There's an old demo of an old system up at http://yourcompany.intra.net/
/Lars
